HD74AC373/HD74ACT373 Octal Transparent Latch with 3-State Output Description Diagram The HD74AC373/HD74ACT373 consists of eight latches with 3-state outputs from bus organized system applications. The flip-flops appear transparent to the data when Latch Enable (LE) is High. When LE is Low, the data that meets the setup time is latched. Data appears on the bus when the Output Enable (OE) is Low. When OE is High, the bus output is in the high impedance state. Features • • • • Eight Latches in a Single Package 3-State Outputs for Bus Interfacing Outputs Source/Sink 24 mA HD74AC373 has TTL-Compatible Inputs HD74AC373/HD74ACT373 Pin Arrangement OE 1 20 VCC O0 2 19 O7 D0 3 18 D7 D1 4 17 D6 O1 5 16 O6 O2 6 15 O5 D2 7 14 D5 D3 8 13 D4 O3 9 12 O4 Gnd 10 11 LE (Top view) Logic Symbol D0 D1 D2 D3 D4 D5 D6 D7 LE OE O0 O1 O2 O3 O4 O5 O6 O7 Pin Names D0 – D7 LE OE O0 – O7 2 Data Inputs Latch Enable Input Output Enable Input 3-State Latch Outputs HD74AC373/HD74ACT373 Truth Table Inputs Outputs OE LE Dn On H X X Z L H L L L H H H L L X O0 H L Z X O0 : : : : : High Voltage Level Low Voltage Level High Impedance Immaterial Previous O 0 before Low-to-High Transition of Clock Functional Description The HD74AC373/HD74ACT373 contains eight D-type latches with 3-state standard outputs. When the Latch Enable (LE) input is High, data on the Dn inputs enters the latches. In this condition the latches are transparent, i.e., a latch output will change state each time its D input changes. When LE is Low, the latches store the information that was present on the D inputs setup time proceding the High-to-Low transition of LE. The 3-state standard outputs are controlled by the Output Enable (OE) input. When OE is Low, the standard outputs are in the 2-state mode. When OE is High, the standard outputs are in the high impedance mode but this does not interfere with entering new data into the latches. Logic Diagram D0 D1 D D2 D G O D3 D G O D4 D G O D5 D G O D6 D G O D7 D G O D G O G O LE OE O0 O1 O2 O3 O4 O5 O6 O7 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 HD74AC373/HD74ACT373 DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 µA VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 µA VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C Maximum ICC/input (HD74ACT373) I CCT 1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V, Ta = Worst case AC Characteristics: HD74AC373 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 10.0 13.5 1.0 15.0 ns 5.0 1.0 7.0 9.5 1.0 10.5 3.3 1.0 9.5 13.0 1.0 14.5 5.0 1.0 7.0 9.5 1.0 10.5 3.3 1.0 10.0 13.5 1.0 15.0 5.0 1.0 7.5 9.5 1.0 10.5 3.3 1.0 9.5 12.5 1.0 14.0 5.0 1.0 7.0 9.5 1.0 10.5 3.3 1.0 9.0 11.5 1.0 13.5 5.0 1.0 7.0 8.5 1.0 9.5 3.3 1.0 8.5 11.5 1.0 13.0 5.0 1.0 6.5 8.5 1.0 9.5 3.3 1.0 10.0 12.5 1.0 14.5 5.0 1.0 8.0 11.0 1.0 12.5 3.3 1.0 8.0 11.5 1.0 12.5 5.0 1.0 6.5 8.5 1.0 10.0 Dn to O n Propagation delay t PHL Dn to O n Propagation delay t PLH LE to O n Propagation delay t PHL LE to O n Output enable time Output enable time Output disable time Output disable time Note: 4 t PZH t PZL t PHZ t PLZ 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V ns ns ns ns ns ns ns HD74AC373/HD74ACT373 AC Characteristics: HD74AC373 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay Dn to O n t PLH 5.0 1.0 8.5 10.0 1.0 11.5 ns Propagation delay Dn to O n t PHL 5.0 1.0 8.0 10.0 1.0 11.5 ns Propagation delay LE to O n t PLH 5.0 1.0 8.5 11.0 1.0 11.5 ns Propagation delay LE to O n t PHL 5.0 1.0 8.0 10.0 1.0 11.5 ns Output enable time t PZH 5.0 1.0 8.0 9.5 1.0 10.5 ns Output enable time t PZL 5.0 1.0 7.5 9.0 1.0 10.5 ns Output disable time t PHZ 5.0 1.0 9.0 11.0 1.0 12.5 ns Output disable time t PLZ 5.0 1.0 7.5 8.5 1.0 10.0 ns Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V AC Operating Requirements: HD74AC373 Ta = –40°C to +85°C CL = 50 pF Ta = +25°C CL = 50 pF Item Symbol VCC (V)*1 Typ Guaranteed Minimum Unit Setup time, HIGH or LOW t su 3.3 3.5 5.5 6.0 ns 5.0 2.0 4.0 4.5 3.3 –3.0 0.0 0.0 5.0 –1.5 0.0 0.0 3.3 4.0 5.5 6.0 5.0 2.0 4.0 4.5 Dn to LE Hold time, HIGH or LOW th Dn to LE LE pulse width, HIGH Note: tw ns ns 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V 5 HD74AC373/HD74ACT373 AC Operating Requirements: HD74ACT373 Ta = –40°C to +85°C CL = 50 pF Ta = +25°C CL = 50 pF Item Symbol VCC (V)*1 Typ Guaranteed Minimum Unit Setup time, HIGH or LOW Dn to LE t su 5.0 3.0 7.0 8.0 ns Hold time, HIGH or LOW Dn to LE th 5.0 0.0 0.0 1.0 ns LE pulse width, HIGH tw 5.0 2.0 7.0 8.0 ns Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V Capacitance Item Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Power dissipation capacitance CPD 40.0 pF VCC = 5.0 V 6 Unit: mm 24.50 25.40 Max 6.30 11 1 7.00 Max 20 10 1.30 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 1.27 Max 2.54 Min 5.08 Max 0.89 7.62 + 0.11 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-20N — Conforms 1.26 g Unit: mm 12.6 13 Max 11 1 10 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 20 0.20 7.80 +– 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-20DA — Conforms 0.31 g Unit: mm 12.8 13.2 Max 11 1 10 0.20 ± 0.10 0.935 Max 1.27 *0.42 ± 0.08 0.40 ± 0.06 *0.27 ± 0.05 0.25 ± 0.04 2.65 Max 7.50 20 0.25 10.40 +– 0.40 1.45 0° – 8° 0.57 0.70 +– 0.30 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-20DB Conforms — 0.52 g Unit: mm 6.50 6.80 Max 11 1 10 4.40 20 0.65 *0.22+0.08 –0.07 0.20 ± 0.06 1.0 0.13 M 6.40 ± 0.20 *Dimension including the plating thickness Base material dimension 0.07 +0.03 –0.04 0.10 *0.17 ± 0.05 0.15 ± 0.04 1.10 Max 0.65 Max 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-20DA — — 0.07 g Cautions 1. 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